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John TorreyJohn Torrey was considered the leader of botanists in America during his lifetime. He published three comprehensive catalogs of North American flora, and was one of the first American botanists to arrange plants by families.
Rubik's CubeRubik's Cube was invented by a Hungarian professor in 1974, as a mental exercise for his students. The cubic puzzle quickly became a craze in Hungary, then spread across Europe, and by 1980 was the top-selling toy in the United States.
Clyde William TombaughClyde William Tombaugh was hired by the Lowell Observatory after sending detailed drawings of observations he had made of Mars and Jupiter using a homemade telescope. It was at Lowell where, in 1930, he discovered a planet orbiting beyond Neptune; that planet was subsequently named Pluto.
BarometerA Barometer is an instrument for measuring atmospheric pressure. The atmosphere exerts a pressure because air has weight and is being pulled to the earth by the force of gravity. For this reason atmospheric pressure depends on the height of air above the point at which it is being measured and is lower on top of a mountain than it is at sea level.
AgateAgate forms when silica in solution seeps into a cavity in lava and hardens in successive layers. Chemically it consists of silicon and oxygen, SiO2.
Jean Baptiste LamarckJean Baptiste Lamarck believed that if an animal began using an organ more than it had in the past, the size of that organ would increase during its lifetime. For example, if a giraffe stretched its neck to reach higher leaves, a "nervous fluid" would flow into its neck and make it longer over time.
LeavesLeaves are the main food-making parts of almost all plants. They capture energy from sunlight and use it to make food out of water from the soil and carbon dioxide. This food provides plants with energy to grow, to produce flowers and seeds, and to carry on all their other activities.
Troupial (Icterus icterus)Troupial (Icterus icterus) This fairly large member of the oriole family is found in northern and central South America. Unlike other orioles it does not build its own nest, relying instead on nests stolen from other birds. It is the national bird of Venezuela.
HearingHearing Man hears sounds when any vibrating object pushes air molecules at a rate between 15 and 15,000 vibrations per second. Sound waves are turned into nerve impulses inside the cochlea.